Slack is the workplace messaging app that changed how the world works. It replaced cluttered email inboxes with organized channels, brought teams together across time zones, and became the go-to communication tool for companies from Fortune 500 giants to two-person startups. But behind the familiar purple logo and those satisfying notification sounds, there is a fascinating ownership story — one that involves a failed video game, a $27.7 billion acquisition, and a dramatic battle with Microsoft for the future of enterprise communication.
What Is Slack?
Slack is a cloud-based workplace messaging and collaboration platform used by teams and organizations around the world. It offers real-time messaging, file sharing, channel organization, and deep integrations with thousands of third-party apps. As of 2025, Slack has 47.2 million daily active users and serves over 750,000 organizations globally, holding approximately 18% of the global team collaboration software market.
Slack operates as Slack Technologies, LLC — a wholly owned subsidiary of Salesforce, Inc. Its products include messaging channels, voice and video calls, workflow automation, and AI-powered features that are being increasingly tied into Salesforce’s broader enterprise software ecosystem.
Who Owns Slack in 2026?
The direct answer is clear: Slack is fully owned by Salesforce, Inc. — one of the world’s largest enterprise software companies, publicly traded on the New York Stock Exchange under the ticker symbol CRM. Salesforce completed its acquisition of Slack Technologies, Inc. on July 21, 2021, paying approximately $27.7 billion — one of the largest software acquisitions in history.
Slack no longer trades independently on the stock market. It operates as a wholly owned subsidiary of Salesforce, with no independent board and no outside investors with governance rights. Every major decision about Slack’s strategy, product roadmap, and budget flows through Salesforce headquarters in San Francisco, California.
Ownership and Key Stakeholders Table
| Owner / Party | Role | Stake | Key Detail |
|---|---|---|---|
| Salesforce, Inc. (NYSE: CRM) | Parent Company & 100% Owner | Full ownership of Slack | Acquired Slack on July 21, 2021 for $27.7 billion |
| Vanguard Group | Largest Salesforce Shareholder | ~8.5% of Salesforce | Passive index fund giant; biggest institutional holder of CRM |
| BlackRock, Inc. | Second Largest Salesforce Shareholder | ~7.2% of Salesforce | World’s largest asset manager |
| Fidelity Investments | Institutional Investor | ~5% of Salesforce | Long-term institutional Salesforce holder |
| State Street Global Advisors | Institutional Investor | Significant CRM stake | Major index fund manager |
| Marc Benioff | Salesforce CEO & Chairman | ~3% of Salesforce | Co-founded Salesforce in 1999; has final authority over Slack |
| Rob Seaman | Interim CEO of Slack | No ownership stake | Slack’s Chief Product Officer; became interim CEO in late 2025 |
| Stewart Butterfield | Co-Founder | Exited late 2022 | Founded Slack in 2009; left after Salesforce integration |
The Origin Story: A Failed Game That Changed the World
Slack was not invented to be a workplace tool. It was born out of failure — and that makes its story one of the most remarkable pivots in technology history.
Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov founded a game studio called Tiny Speck in 2009 in Vancouver, British Columbia, Canada. The team spent years building an online game called Glitch — a quirky, ambitious multiplayer world that never quite found its audience. Glitch was shut down commercially, leaving the team with nothing to show for years of work.
But while building Glitch, the team had created an internal messaging tool to communicate with each other. When the game failed, they looked at what they had left — and realized the messaging tool was actually extraordinary. They pivoted entirely. Slack launched publicly in August 2013 as a preview and opened fully to the public in February 2014. On its very first day of public availability, 8,000 companies signed up. Within 24 hours, it was already one of the fastest-adopted software products in history.
From Startup to $27.7 Billion: The Salesforce Acquisition
Slack went public on the New York Stock Exchange in June 2019 through a direct listing — skipping the traditional IPO process — at a valuation of approximately $23 billion. It was one of the most high-profile tech listings of that year.
But independence did not last long. On December 1, 2020, Salesforce announced it had agreed to acquire Slack for approximately $27.7 billion in cash and stock. The deal closed on July 21, 2021, and from that moment Slack became a Salesforce subsidiary. At the time, it was the largest acquisition in Salesforce’s history and one of the biggest software deals ever completed anywhere in the world.
Salesforce CEO Marc Benioff framed the acquisition as the cornerstone of his company’s strategy to build the “digital HQ” for every business on earth — a place where employees, customers, and data all come together in one unified platform.
Who Runs Slack Today?
Leadership at Slack has seen significant change since the Salesforce acquisition.
Stewart Butterfield, the co-founder and longtime CEO who built Slack from a failed video game into a $27 billion company, departed Salesforce in late 2022 after the integration was well underway. Denise Dresser took over as Slack’s CEO and led the company through its deep integration into Salesforce’s platform. In December 2025, Dresser left to become Chief Revenue Officer at OpenAI. Rob Seaman, Slack’s Chief Product Officer, was named interim CEO and leads the business day-to-day as of early 2026.
Above Seaman sits Marc Benioff — Salesforce’s Chairman and CEO — who holds final authority over Slack’s strategy and budget as the head of the parent company.
Slack and the Agentforce AI Revolution
The most important current development in Slack’s story is its transformation into the front door for Salesforce’s most ambitious product — Agentforce.
Salesforce reported $41.5 billion in revenue in fiscal 2026 and has tied its entire AI narrative closely to Slack. Marc Benioff has stated that Slack-specific revenue is expected to reach $3 billion in fiscal 2026 — a significant milestone for a product that many observers wondered would lose its identity inside a giant corporation.
Agentforce is Salesforce’s autonomous AI agent platform, and Slack is the primary interface through which those agents interact with human users. In simple terms: if Agentforce is the brain, Slack is the mouth. Every time a Salesforce AI agent sends a message, completes a task, or asks for human input, it does so through Slack. That positioning turns Slack from a messaging cost center into the entry point for Salesforce’s most important growth product of the next decade.
Slack vs. Microsoft Teams: The Battle Continues
Understanding Slack’s ownership also means understanding the competitive war it is fighting every single day — against Microsoft Teams, a rival backed by the most valuable company in the world.
Microsoft launched Teams in 2017 and bundled it directly into Microsoft 365 subscriptions, giving it an enormous distribution advantage. The battle between these two platforms is ultimately a battle between Salesforce (valued at approximately $153 billion) and Microsoft (valued at approximately $3 trillion) — two of the most powerful enterprise software companies in human history.
Slack’s advantage lies in its open ecosystem, its deep API integrations, and its superior user experience for teams that live and breathe digital-first work. Microsoft Teams wins on bundling and enterprise lock-in. The outcome of this competition will define the future of workplace communication for millions of companies worldwide.
Frequently Asked Questions (FAQs)
Q1. Who owns Slack in 2026?
Slack is fully owned by Salesforce, Inc. (NYSE: CRM), which acquired it for $27.7 billion on July 21, 2021.
Q2. Is Slack still an independent company?
No. Slack operates as a wholly owned subsidiary of Salesforce with no independent board or outside investors.
Q3. Who founded Slack and when?
Slack was co-founded by Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov in 2009 in Vancouver, Canada.
Q4. Who is the current CEO of Slack in 2026?
Rob Seaman, Slack’s former Chief Product Officer, is the interim CEO after Denise Dresser departed in December 2025 to join OpenAI.
Q5. How much did Salesforce pay for Slack?
Salesforce acquired Slack for approximately $27.7 billion in a cash-and-stock deal that closed on July 21, 2021.
Q6. How many users does Slack have in 2026?
Slack has 47.2 million daily active users and serves over 750,000 organizations worldwide as of 2025.
Q7. Who are the biggest shareholders of Salesforce, Slack’s parent company?
The largest shareholders of Salesforce are Vanguard Group (~8.5%), BlackRock (~7.2%), and Fidelity (~5%).
Q8. How much revenue does Slack generate?
Salesforce CEO Marc Benioff has stated that Slack-specific revenue is expected to reach approximately $3 billion in fiscal 2026.
Slack is 100% owned by Salesforce, Inc. (NYSE: CRM), which acquired it for $27.7 billion on July 21, 2021. Salesforce itself is publicly traded, with Vanguard Group (~8.5%), BlackRock (~7.2%), and Fidelity (~5%) as the largest institutional shareholders. Marc Benioff owns approximately 3% personally and holds final authority over Slack’s direction.
Slack was founded in 2009 in Vancouver, Canada by Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov — built from the ruins of a failed video game called Glitch. It launched publicly in 2013, went public in 2019, and was acquired by Salesforce in 2021. Today, under interim CEO Rob Seaman, Slack serves 47.2 million daily active users across 750,000 organizations and is being transformed into the primary interface for Salesforce’s Agentforce AI platform — the most consequential chapter yet in Slack’s extraordinary story.